diff --git a/ddsp/colab/demos/timbre_transfer.ipynb b/ddsp/colab/demos/timbre_transfer.ipynb
index 8a98c3f5..115a9130 100644
--- a/ddsp/colab/demos/timbre_transfer.ipynb
+++ b/ddsp/colab/demos/timbre_transfer.ipynb
@@ -410,7 +410,7 @@
         "    os.makedirs(PRETRAINED_DIR, exist_ok=True)\n",
         "    GCS_CKPT_DIR = 'gs://ddsp/models/timbre_transfer_colab/2021-07-08'\n",
         "    model_dir_gcs = os.path.join(GCS_CKPT_DIR, 'solo_%s_ckpt' % args.model.lower())\n",
-        "    os.system(f'gcloud storage cp {model_dir_gcs}/* {PRETRAINED_DIR}')  \n",
+        "    os.system(f'gsutil cp {model_dir_gcs}/* {PRETRAINED_DIR}')  \n",
         "    model_dir = PRETRAINED_DIR\n",
         "  else:\n",
         "    # Custom model: assume uploaded and unzipped at /content/uploaded\n",
diff --git a/ddsp/core.py b/ddsp/core.py
index 92eb84da..49b56583 100644
--- a/ddsp/core.py
+++ b/ddsp/core.py
@@ -294,7 +294,7 @@ def midi_to_hz(notes: Number, midi_zero_silence: bool = False) -> Number:
   # Map MIDI 0 as 0 hz when MIDI 0 is silence.
   if midi_zero_silence:
     hz = tf.where(tf.equal(notes, 0.0), 0.0, hz)
-  return hz
+  return hz  # pyrefly: ignore[bad-return]
 
 
 def hz_to_midi(frequencies: Number) -> Number: